Oxford Centre for High Energy Density Science (OxCHEDS)

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Spectroscopy of astrophysical plasmas in the laboratory

Astronomy & Geophysics Oxford University Press (OUP) 45:6 (2004) 6.18-6.21

Authors:

FP Keenan, SJ Rose
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Vulcan Petawatt—an ultra-high-intensity interaction facility

Nuclear Fusion IOP Publishing 44:12 (2004) s239-s246

Authors:

CN Danson, PA Brummitt, RJ Clarke, JL Collier, B Fell, AJ Frackiewicz, S Hancock, S Hawkes, C Hernandez-Gomez, P Holligan, MHR Hutchinson, A Kidd, WJ Lester, IO Musgrave, D Neely, DR Neville, PA Norreys, DA Pepler, CJ Reason, W Shaikh, TB Winstone, RWW Wyatt, BE Wyborn
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Molecular-dynamic calculation of the inverse-bremsstrahlung heating of non-weakly-coupled plasmas

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 70:5 2 (2004)

Authors:

N David, DJ Spence, SM Hooker

Abstract:

The inverse bremsstrahlung (IB) heating rates of a plasma as a function of density and laser intensity were calculated using a molecular dynamic (MD) code. The code belonged to the class of particle-particle-particle-mesh codes. The equations solved by the MD code avoided several assumptions which were inherent to alternative methods. The results of the MD code were compared to previous results for plasmas of low coupling. The results of the calculations for dense, moderately coupled plasmas were also presented. An analytic expression for the IB heating rate, based on a fit to the rates calculated by MD code, was also presented.
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Observations of the filamentation of high-intensity laser-produced electron beams

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 70:5 2 (2004)

Authors:

MS Wei, FN Beg, EL Clark, AE Dangor, RG Evans, A Gopal, KWD Ledingham, P McKenna, PA Norreys, M Tatarakis, M Zepf, K Krushelnick

Abstract:

The structure of the hot electron beams emitted in laser-solid target interactions was analyzed. It was observed that electron beams were emitted from the rear of thin solid targets irradiated by a high-intensity short-pulse laser. It was shown that the most important condition in which electron beam filamentation due to Weibel-like instabilities become a factor were situations where large regions of low-density plasma exist. The results suggest that Weibel-like instabilities might not be important for the fast-ignitor scheme.
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Molecular-dynamic calculation of the inverse-bremsstrahlung heating of non-weakly-coupled plasmas.

Phys Rev E Stat Nonlin Soft Matter Phys 70:5 Pt 2 (2004) 056411

Authors:

N David, DJ Spence, SM Hooker

Abstract:

A molecular dynamic (MD) code is used to calculate the inverse bremsstrahlung (IB) heating rates of a plasma as a function of density and laser intensity. The code belongs to the class of particle-particle-particle-mesh codes. Since the equations solved by the MD code are fundamental, this approach avoids several assumptions which are inherent to alternative methods, for example those which employ a Coulomb logarithm, and is not restricted to weakly coupled plasmas. The results of the MD code are compared to previously published results for plasmas of low coupling. The results of calculations for dense, moderately coupled plasmas are also presented. An analytic expression for the IB heating rate, based on a fit to the rates calculated by the MD code, is suggested. This expression includes terms nonlinear in the plasma density.
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